# list1 = [1,2,3,2]

# a = list1[0]

# for i in list1:
#     if i > a:
#         a = i
# print(a)


# print（isinstance('1',int)

# list2 = [1,2,3,4,'a',1]

# sum = 0

# for i in list2:
#     if isinstance(i,int):
#         sum = sum + i
# print(sum)

# x = 6
# for i in range(2,x):
#     if x % i == 0:
#         print("不是素数")
#         break
# else:
#     print("是素数")




x = 10

for i in range(2,x+1):
    for j in range(2,i):
        if i % j == 0:
            break
        else:
            sum = sum + 1
print(sum)




